US4046943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Malonic acid derivative composition for forming thermoparticulating coating
Assignee: Westinghouse Electric Corp
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Filing: 1976-07-16
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Granted: 1977-09-06
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Expires: 1996-07-16
Abstract
Abstract A composition is disclosed of a malonic acid derivative, a resinous carrier, and a solvent. The composition is applied to a portion of an electrical apparatus which is exposed to a gas stream. The solvent in the composition is evaporated to produce a thermoparticulating coating. When the electrical apparatus overheats the malonic acid derivative in the coating forms particles in the gas stream which are detected by a monitor.
Inventors
- 👤 James D. B. Smith
- 👤 David C. Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:56
CPC Classifications
G; G01; G01K; G01K11/00; G01K11/10; C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/42; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/269; Y10T428/31504; Y10T428/31511; Y10T428/31529
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
90 words
A composition comprising (1) at least one compound having the general formula ##STR2## which decomposes to produce detectable particles between about 60° to about 200° C., where R is selected from the group consisting of alkyl from C 1 to C 10 , aryl, alkyl aryl from C 1 to C 10 , cycloaliphatic, and heterocyclic, and R 1 is selected from the group consisting of R and hydrogen; and (2) a solution of at least one resinous carrier curable and stable at 60° C. and unreactive with said compound.
Claim 2
Dependent Claim
90 words
A composition comprising (1) at least one compound having the general formula ##STR2## which decomposes to produce detectable particles between about 60° to about 200° C., where R is selected from the group consisting of alkyl from C 1 to C 10 , aryl, alkyl aryl from C 1 to C 10 , cycloaliphatic, and heterocyclic, and R 1 is selected from the group consisting of R and hydrogen; and (2) a solution of at least one resinous carrier curable and stable at 60° C. and unreactive with said compound.
Claim 3
Dependent Claim
15 words
A composition according to claim 1 wherein said compound contains at least five carbon atoms.
Claim 4
Dependent Claim
12 words
A composition according to claim 2 wherein said compound is monoethylmalonic acid.
Claim 5
Dependent Claim
12 words
A composition according to claim 2 wherein said compound is dimethylmalonic acid.
Claim 6
Dependent Claim
41 words
A composition according to claim 1 wherein the amount of said compound is about 20 to about 250 phr and the amount of the solvent in said solution is about 25 to about 75% (by weight based on said resinous carrier).
Claim 7
Dependent Claim
38 words
A composition according to claim 5 wherein the amount of said compound is about 40 to about 60 phr and the amount of said solvent is about 45 to about 55% (by weight based on said resinous carrier).
Claim 8
Dependent Claim
14 words
A composition according to claim 1 wherein said resinous carrier is an epoxy resin.
Claim 9
Dependent Claim
21 words
A composition according to claim 7 which includes about 0.1 to about 3 phr of a drier for said epoxy resin.
Claim 10
Dependent Claim
26 words
A composition according to claim 8 which is prepared by first mixing said solution of resinous carrier and said drier and then mixing in said compound.
Claim 11
Dependent Claim
14 words
A composition according to claim 1 where the solvent in said solution is toluene.
Claim 12
Dependent Claim
14 words
A composition according to claim 1 wherein said compound is dispersed in said solution.
Claim 13
Dependent Claim
12 words
A composition according to claim 1 wherein said resinous carrier is air-dryable.
Claim 14
Dependent Claim
17 words
A thermoparticulating coating comprising a solid layer of a composition according to claim 1 on a substrate.
Claim 15
Dependent Claim
12 words
A coating according to claim 13 wherein said substrate is an insulator.
Claim 16
Dependent Claim
15 words
A coating according to claim 13 which is about 1/16 to about 1/2 inch thick.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-05 | 1981-03-07 | 1981-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-05 | 1985-03-07 | 1985-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-05 | 1989-03-07 | 1989-09-06 | $7700.00 | Window Closed / Lapsed |